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標題: 計算ip camera viewing angle公式 [打印本頁]

作者: admin 時間: 2008-9-29 01:49 PM 標題: 計算ip camera viewing angle公式

1/3"    CCD will have a wider viewing angle(15°more) than 1/4" CCD.In general,    2.5mm~2.8mm is suitable for shooting distance that is less than 15 ft    CCD size and Lens focal length will affect the viewing angle. The following    table is a summary of viewing angle for different CCD and Lens.

	1/4" CCD (Dome type)	1/3" CCD (Dome type)	1/3" CCD (Standard type)
2.5mm	95	130	120
3.6mm	70	90	-
4mm	-	-	70
4.3mm	60	80	-
6mm	50	70	53
8mm	35	50	40
12mm	25	30	25
16mm	20	25	20
25mm	9	15	12

To select a suitable lens please follow the following steps <A> Measure the distance between the camera and the shooting target. We call this the viewing distance--L <B> Measure the viewing width--W. Use the following trigonometric formula to find out the viewing angle. Viewing angle = 2 * Arc tan (W/2L)

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